https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13952274Edit ImageSaveSaveEditCropCustom TextIsaac Swainson promoting his 'Velnos syrup', facing an onslaught of rival practitioners advocating mercury. Coloured etching by T. Rowlandson, 1789.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 836 px | 300 dpiLarge JPEG 3429 x 2390 px | 300 dpiFree DownloadIsaac Swainson promoting his 'Velnos syrup', facing an onslaught of rival practitioners advocating mercury. Coloured etching by T. Rowlandson, 1789.More